CN116453449A - Display device and working method thereof - Google Patents

Display device and working method thereof Download PDF

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Publication number
CN116453449A
CN116453449A CN202310039588.0A CN202310039588A CN116453449A CN 116453449 A CN116453449 A CN 116453449A CN 202310039588 A CN202310039588 A CN 202310039588A CN 116453449 A CN116453449 A CN 116453449A
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CN
China
Prior art keywords
edge
image signal
pixel
weight
display device
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Pending
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CN202310039588.0A
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Chinese (zh)
Inventor
张沅宇
朴胜虎
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Samsung Display Co Ltd
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Samsung Display Co Ltd
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Publication of CN116453449A publication Critical patent/CN116453449A/en
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2092—Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • G09G3/2096—Details of the interface to the display terminal specific for a flat panel
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/10—Segmentation; Edge detection
    • G06T7/13—Edge detection
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0439—Pixel structures
    • G09G2300/0452—Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0242—Compensation of deficiencies in the appearance of colours
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0285—Improving the quality of display appearance using tables for spatial correction of display data
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0693—Calibration of display systems

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The invention discloses a display device and a working method thereof, wherein the display device comprises: a display panel; and a driving circuit receiving an input image signal and providing an output image signal to the display panel, the driving circuit including: an edge and slope detector detecting an edge of the input image signal and calculating an angle between the edge and a virtual line parallel to a first direction; a weight calculator that calculates a weight from the edge and the angle; and a rendering section that compensates the input image signal according to the weight calculated by arithmetic operation of the edge and the angle, and outputs the output image signal.

Description

Display device and working method thereof
Technical Field
The invention relates to a display device and a working method thereof.
Background
The display device includes a display panel including a plurality of pixels. Each of the plurality of pixels may provide any one of various color lights such as red light, green light, and blue light.
A desired image may be displayed by adjusting the light emission intensity of each of the plurality of pixels.
The size and arrangement of each of the plurality of pixels may be varied.
Disclosure of Invention
The invention aims to provide a display device and an operating method thereof, which can prevent the quality of a display image from being reduced according to the arrangement mode of pixels.
According to a feature of the present invention for achieving the object as described above, a display device includes: a display panel; and a driving circuit receiving an input image signal and providing an output image signal corresponding to the input image signal to the display panel. The driving circuit includes: an edge and slope detector detecting an edge of the input image signal and calculating an angle between the edge and a virtual line parallel to a first direction; a weight calculator that calculates a weight from the edge and the angle; and a rendering section that compensates the input image signal according to the weight calculated by arithmetic operation of the edge and the angle, and outputs the output image signal.
In an embodiment, the edge and slope detector may calculate a first edge by a convolution operation of the input image signal and a first filter, calculate a second edge by a convolution operation of the input image signal and a second filter, and output the edge according to the first edge and the second edge.
In one embodiment, the edge is calculated by the mathematical expression EG= |EG_x|+|EG_y|, EG is the edge, EG_x is the first edge, and EG_y is the second edge.
In an embodiment, the larger the value of the edge, the larger the weight, and the smaller the angle, the larger the weight.
In one embodiment, the edge is defined by the formulaTo calculate, EG is the edge, EG_x is the first edge, EG_y isThe second edge.
In one embodiment, the first filter may include a determinant gx, the second filter may include a determinant gy,
in an embodiment, the weight calculator may include: a first lookup table storing a first compensation value corresponding to the edge; and a second lookup table storing a second compensation value corresponding to the angle.
In an embodiment, the weight may be calculated by the mathematical formula w= (lut_eg×lut_ag), W is the weight, lut_eg is the first compensation value, and lut_ag is the second compensation value.
In one embodiment, the weight may be calculated by the formula wq= (lut_eg×lut_ag) ×g_q, where WQ is the weight, lut_eg is the first compensation value, lut_ag is the second compensation value, and g_q is a panel compensation value.
In an embodiment, the display panel may include first, second and third pixels disposed in the first, second and third pixel regions.
In an embodiment, the first pixel region may be disposed in a first pixel row, and the second pixel region and the third pixel region may be disposed in a second pixel row adjacent to the first pixel row.
In an embodiment, the input image signal may include a first color signal, a second color signal, and a third color signal corresponding to the first pixel, the second pixel, and the third pixel, respectively.
In an embodiment, the rendering section may render the first color signal using a first rendering filter including the weight, and render the second color signal using a second rendering filter including the weight, and render the third color signal using a third rendering filter including the weight.
The operating method of the display device according to one feature of the present invention includes: detecting an edge of an input image signal; a step of calculating an angle between the edge and a virtual line parallel to the first direction; a step of calculating a weight from the edge and the angle; and a step of compensating the input image signal according to the weight calculated by arithmetic operation of the edge and the angle, and outputting an output image signal.
In an embodiment, the step of detecting the edge may include: a first edge is calculated by a convolution operation of the input image signal and a first filter, and a second edge is calculated by a convolution operation of the input image signal and a second filter, and the edges are output according to the first edge and the second edge.
In one embodiment, the edge is calculated by the mathematical expression EG= |EG_x|+|EG_y|, EG is the edge, EG_x is the first edge, and EG_y is the second edge.
In an embodiment, the smaller the angle, the greater the weight, the greater the value of the edge, and the greater the weight.
In one embodiment, the edge is defined by the formulaTo calculate, EG is the edge, EG_x is the first edge, and EG_y is the second edge.
In an embodiment, the weight may be calculated by the mathematical expression wq= (lut_eg×lut_ag) ×g_q, WQ is the weight, lut_eg is a first compensation value corresponding to the edge, lut_ag is a second compensation value corresponding to the angle, and g_q is a panel compensation value.
In an embodiment, the display panel may include a first pixel, a second pixel, and a third pixel disposed in a first pixel region, a second pixel region, and a third pixel region, respectively, where the first pixel region is disposed in a first pixel row, and the second pixel region and the third pixel region are disposed in a second pixel row adjacent to the first pixel row.
The display device having the above-described configuration detects an edge of an input image signal and a slope of the edge. When the input image signal has edges and edge slopes that may degrade the quality of the display image, the input image signal may be corrected to provide the output image signal to the display panel. Accordingly, degradation of display quality in a display device having a specific pixel arrangement can be prevented.
Drawings
Fig. 1 is a perspective view of a display device according to an embodiment of the present invention.
Fig. 2 is a block diagram of a display device according to an embodiment of the present invention.
Fig. 3 is a plan view of a display area of a display panel according to an embodiment of the present invention.
Fig. 4 exemplarily shows an image pattern displayed on the display panel.
Fig. 5 is a block diagram showing the constitution of a drive controller according to an embodiment of the present invention.
Fig. 6a schematically shows a test image for testing the visibility from the edges and slope of the image.
Fig. 6b is a diagram showing the test image in an enlarged manner.
Fig. 7 shows exemplary evaluation scores of the test images shown in fig. 6a and 6 b.
Fig. 8 is a graph showing an example of normalization of the compensation value with respect to the edge detected in the edge and slope detector shown in fig. 5.
Fig. 9 is a graph showing an example of normalization of the compensation value with respect to the angle detected in the edge and slope detector shown in fig. 5.
Fig. 10 graphically illustrates the visibility test results shown in fig. 7.
Fig. 11 exemplarily shows a case of upsampling the edge-angle chart shown in fig. 10.
Fig. 12 shows the product of edge and angle when normalizing the edge and angle detected in the edge and slope detector shown in fig. 5.
Fig. 13 shows differences in edges and angles when normalizing the edges and angles detected in the edge and slope detector shown in fig. 5.
Fig. 14a, 14b, and 14c exemplarily show a rendering filter of the rendering section shown in fig. 5.
Fig. 15a is a test pattern of an input image signal.
Fig. 15b and 15c exemplarily show a case where a test pattern is displayed on the display panel.
Fig. 16 is a flowchart of an operating method of a display device according to an embodiment of the present invention.
Detailed Description
In this specification, when any constituent element (or region, layer, portion, or the like) is referred to as being "on", "connected to" or "combined with" another constituent element, it means that any constituent element may be directly arranged/connected/combined with another constituent element or a third constituent element may be arranged therebetween.
Like reference numerals refer to like constituent elements. In the drawings, thicknesses, ratios, and sizes of constituent elements are exaggerated for effective explanation of technical contents. "and/or" includes all combinations of more than one defined by the relative compositions.
The terms first, second, etc. may be used to describe various elements, but the above elements are not limited by the above terms. The above terms are used only for the purpose of distinguishing one constituent element from another. For example, a first constituent element may be named a second constituent element, and similarly, a second constituent element may be named a first constituent element without departing from the scope of the claims of the present invention. Singular expressions include plural expressions, provided that they are not explicitly stated as different in context.
The terms "lower", "upper", and the like are used to describe the association relationship of the components shown in the drawings. The terms are relative concepts and are described with reference to the directions shown in the drawings.
The terms "comprises" and "comprising" and the like are to be interpreted as specifying the presence of the stated features, numbers, steps, operations, constituent elements, components, or combination thereof, as referred to in the specification, without precluding the presence or addition of one or more other features, or numbers, steps, operations, constituent elements, components, or combination thereof.
Unless defined differently, all terms (including technical terms and scientific terms) used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. In addition, terms such as those defined in commonly used dictionaries should be interpreted as having the same meaning as the related art's suprachoroidal meaning and should not be interpreted as having an excessively idealized or formalized meaning unless explicitly defined herein.
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Fig. 1 is a perspective view of a display device DD according to an embodiment of the invention.
Referring to fig. 1, the display device DD may be a device activated according to an electrical signal. The display device DD according to the present invention may be a large display device such as a television, a monitor, or the like, and a small and medium display device such as a mobile phone, a tablet, a notebook, a car navigator, a game machine, or the like. These are presented as examples only, and it is obvious that other forms of display device may be included without departing from the scope of the inventive concept.
The display device DD has a rectangular shape having a long side in a first direction DR1 and a short side in a second direction DR2 intersecting the first direction DR 1. However, the shape of the display device DD is not limited thereto, and various shapes of the display device DD may be provided. The display device DD may display the image IM toward the third direction DR3 in a display surface IS parallel to each of the first direction DR1 and the second direction DR 2. The display surface IS of the display image IM may correspond to a front surface (front surface) of the display device DD.
In the present embodiment, the front (or upper) and back (or lower) of each component are defined with reference to the direction in which the image IM is displayed. The front and rear faces may face each other in the third direction DR3 (opening), and a normal direction of each of the front and rear faces may be parallel to the third direction DR 3.
The separation distance between the front and rear surfaces in the third direction DR3 may correspond to a thickness in the third direction DR3 of the display apparatus DD. On the other hand, the directions indicated by the first to third directions DR1, DR2, DR3 are relative concepts, and may be converted into other directions.
The display device DD may sense an external input applied from the outside. The external input may include various forms of input provided from the outside of the display device DD. The display device DD according to an embodiment of the invention may sense external input of a user applied from the outside. The external input of the user may be any one of various forms of external input of a part of the user's body, light, heat, sight, or pressure, or a combination thereof. The display device DD may sense external input of a user applied to a side surface or a rear surface of the display device DD according to a structure of the display device DD, and is not limited to any one of the embodiments. As an example of the present invention, the external input may include input by an input device (for example, a stylus, an active pen, a touch pen, an electronic pen, an e-pen, or the like).
The display surface IS of the display device DD may be divided into a display area DA and a non-display area NDA. The display area DA may be an area where the image IM is displayed. The user recognizes the image IM through the display area DA. In the present embodiment, the display area DA is shown as a quadrangular shape with rounded vertices. However, which is an exemplary case, the display area DA may have various shapes, not limited to any one embodiment.
The non-display area NDA is adjacent to the display area DA. The non-display area NDA may have a predetermined color. The non-display area NDA may surround the display area DA. Thus, the shape of the display area DA may be substantially defined by the non-display area NDA. However, which is an exemplary case, the non-display area NDA may be configured to be adjacent to only one side of the display area DA, or may be omitted. The display device DD according to an embodiment of the invention may include various embodiments, not limited to any one embodiment.
Fig. 2 is a block diagram of a display device DD according to an embodiment of the invention.
Referring to fig. 2, the display device DD includes a driving controller 100, a data driving circuit 200, and a display panel DP.
The driving controller 100 receives input image signals RGB and control signals CTRL. The driving controller 100 generates an output image signal DS that converts the data format of the input image signal RGB in a manner matching the interface specification of the data driving circuit 200. The driving controller 100 outputs a scan control signal SCS and a data control signal DCS.
The data driving circuit 200 receives the data control signal DCS and the output image signal DS from the driving controller 100. The data driving circuit 200 converts the output image signal DS into a data signal and outputs the data signal to a plurality of data lines DL1 to DLm described later. The data signal is an analog voltage corresponding to the gray level of the output image signal DS.
The display panel DP according to an embodiment of the present invention may be a light emitting type display panel. For example, the display panel DP may be an organic light emitting display panel, an inorganic light emitting display panel, or a quantum dot (quantum dot) light emitting display panel. The light emitting layer of the organic light emitting display panel may contain an organic light emitting substance. The light emitting layer of the inorganic light emitting display panel may contain an inorganic light emitting substance. The light emitting layer of the quantum dot light emitting display panel may include quantum dots, quantum rods, and the like. Hereinafter, the display panel DP in this embodiment is described as an organic light emitting display panel.
The display panel DP includes scanning lines GL1-GLn, data lines DL1-DLm, and pixels PX11-PXnm. The display panel DP may further include a scan driving circuit 300. In one embodiment, the scan driving circuit 300 is arranged on the first side of the display panel DP. The scan lines GL1 to GLn extend from the scan driving circuit 300 in the first direction DR 1.
The driving controller 100, the data driving circuit 200, and the scan driving circuit 300 may be driving circuits for supplying data signals corresponding to the input image signals RGB of the display panel DP to the pixels PX11 to PXnm.
The pixels PX11 to PXnm may be disposed in the display area DA of the display panel DP, and the scan driving circuit 300 may be disposed in the non-display area NDA.
The scan lines GL1 to GLn extend from the scan driving circuit 300 in the first direction DR1 and are arranged to be spaced apart from each other in the second direction DR 2. The data lines DL1 to DLm extend from the data driving circuit 200 in the second direction DR2 and are arranged to be spaced apart from each other in the first direction DR 1.
Each of the plurality of pixels PX11 to PXnm may be connected to a corresponding one of the scan lines GL1 to GLn and connected to a corresponding one of the data lines DL1 to DLm. Fig. 2 shows that one pixel PX11-PXnm is connected to one scan line, but the present invention is not limited thereto. One pixel PX11-PXnm may be electrically connected to more than two scan lines.
Each of the plurality of pixels PX11 to PXnm may include a light emitting element (not shown) and a pixel circuit portion (not shown) that controls light emission of the light emitting element. In one embodiment, the light emitting element may be an organic light emitting diode. However, the present invention is not limited thereto.
The scan driving circuit 300 receives the scan control signal SCS from the driving controller 100. The scan driving circuit 300 may output a scan signal to the scan lines GL1 to GLn in response to the scan control signal SCS. In one embodiment, the scan driving circuit 300 may be formed by the same process as the pixel circuit part within the pixels PX11-PXnm.
Fig. 3 is a plan view of the display area DA of the display panel DP according to an embodiment of the present invention.
Referring to fig. 3, the first to third pixel regions pxa_ R, PXA _ G, PXA _b may be disposed in the display region DA of the display panel DP (refer to fig. 2).
In one embodiment, the first to third pixel areas pxa_ R, PXA _ G, PXA _b may be repeatedly disposed on the whole display area DA. A peripheral region NPXA is disposed around the first to third pixel regions pxa_ R, PXA _ G, PXA _b. The peripheral region NPXA sets boundaries of the first to third pixel regions pxa_ R, PXA _ G, PXA _b and prevents color mixing between the first to third pixel regions pxa_ R, PXA _ G, PXA _b.
In the present embodiment, the first to third pixel regions pxa_ R, PXA _ G, PXA _b having areas different from each other on the plane are exemplarily shown, but not limited thereto. The areas of two or more of the first to third pixel areas pxa_ R, PXA _ G, PXA _b may be the same as each other. The first to third pixel regions pxa_ R, PXA _ G, PXA _b having a polygonal shape on a plane are shown in fig. 3, but are not limited thereto. The first to third pixel areas pxa_ R, PXA _ G, PXA _b may be embodied as polygonal shapes having other shapes such as a rectangle, a diamond, a pentagon, and the like in a plane.
In an embodiment, the first pixel region pxa_r may provide a first color light (e.g., red light), the second pixel region pxa_g may provide a second color light (e.g., green light), and the third pixel region pxa_b may provide a third color light (e.g., blue light).
The first to third pixel regions pxa_ R, PXA _ G, PXA _b may correspond to the first to third pixels among the pixels PX11 to PXnm (refer to fig. 2), respectively. The first to third pixels may be red, green, and blue pixels.
The second pixel region pxa_g is disposed in the first pixel row PXL1, and the first pixel region pxa_r and the third pixel region pxa_b are disposed in the second pixel row PXL2 adjacent to the first pixel row PXL 1. Due to such pixel arrangement, a user may recognize a color edge (color) phenomenon.
Fig. 4 exemplarily shows an image pattern displayed on the display panel DP.
Referring to fig. 4, the image IMG displayed on the display panel DP (refer to fig. 2) includes a background image of black gray scale and a box image of white gray scale. The green light may be displayed in a boundary area A1 where the background image and the box-shaped image intersect, and the boundary area A2 may be displayed in magenta light.
As such, the reason why the undesired image is displayed in the boundary areas A1, A2 is due to the arrangement of the first to third pixel areas pxa_ R, PXA _ G, PXA _b shown in fig. 3.
Since the second pixel region pxa_g providing green light is arranged in the first pixel row PXL1, green light can be recognized in the boundary region A1. Further, since the first pixel region pxa_r that supplies red light and the third pixel region pxa_b that supplies blue light are arranged in the second pixel row PXL2, magenta light can be recognized in the boundary region A2.
Fig. 5 is a block diagram showing the constitution of the drive controller 100 according to an embodiment of the present invention.
Referring to fig. 5, the driving controller 100 includes an edge and slope detector 110, a weight calculator 120, a first gamma corrector 130, a rendering part 140, and a second gamma corrector 150.
The edge and slope detector 110 detects an edge (or boundary line) of the input image signal RGB and calculates a slope of the detected edge.
When the difference value of the input image signals RGB corresponding to two adjacent pixels among the pixels PX11 to PXnm (refer to fig. 2) is greater than the reference value, it can be discriminated as the edge of the input image signal RGB. The edge and slope detector 110 may detect edges by a convolution (rotation) operation of the input image signal RGB and a k×k (k is a positive integer) filter (or mask).
In one embodiment, the size of the filter may be 3×3.
The first edge (eg_x) in the first direction DR1 (refer to fig. 2) (or the lateral direction) of the input image signal RGB can be calculated by equation 1.
[ mathematics 1]
EG_x＝RGB×gx
In equation 1, gx is a transversal direction filter.
That is, the first edge (eg_x) in the lateral direction of the input image signal RGB can be calculated by a convolution operation of the input image signal RGB and the lateral direction filter (gx).
The second edge (eg_y) in the second direction DR2 (refer to fig. 2) (or the longitudinal direction) of the input image signal RGB can be calculated by equation 2.
[ math figure 2]
EG_y＝RGB×gy
In the equation 2, gy is a longitudinal direction filter.
That is, the second edge (eg_y) in the longitudinal direction of the input image signal RGB can be calculated by a convolution operation of the input image signal RGB and the longitudinal direction filter (gy).
In an embodiment, the transversal direction filter (gx) and the longitudinal direction filter (gy) may be:
in an embodiment, the transversal direction filter (gx) and the longitudinal direction filter (gy) may be:
in an embodiment, the transversal direction filter (gx) and the longitudinal direction filter (gy) may be:
the size and value of the transverse direction filter (gx) and the longitudinal direction filter (gy) are not limited to the above examples.
The edge EG of the input image signal RGB may be calculated from a first edge (eg_x) in the lateral direction and a second edge (eg_y) in the longitudinal direction of the input image signal RGB.
In one embodiment, the edge EG of the input image signal RGB can be calculated by equation 3.
[ math 3]
EG＝|EG_x|+|EG_y|
In one embodiment, the edge EG of the input image signal RGB can be calculated by equation 4.
[ mathematics 4]
The angle AG between the edge EG of the input image signal RGB and a virtual line parallel to the first direction DR1 (refer to fig. 2) can be calculated by equation 5.
[ math 5]
The larger the value of the edge EG of the input image signal RGB calculated by the equation 3 or the equation 4 and the smaller the angle AG mean that the edge intensity in the first direction DR1 is larger. That is, when the edge EG of the input image signal RGB is large and the angle AG is small, a color edge phenomenon may occur in the boundary areas A1, A2 shown in fig. 4.
The weight calculator 120 calculates a weight WQ from the edge EG and the angle AG of the input image signal RGB calculated by the edge and slope detector 110. The weight WQ may be a compensation value for the input image signal RGB.
The weight calculator 120 may store the compensation value for each of the edge EG and the angle AG to a lookup table. In one embodiment, when the first compensation value for the edge EG is set to lut_eg and the second compensation value for the angle AG is set to lut_ag, the weight W may be calculated by equation 6.
[ math figure 6]
W＝LUT_EG×LUT_AG
The weight W is a value calculated by arithmetic operation of the edge EG and the angle AG. The weight calculator 120 calculates the weight WQ by multiplying the weight W by a gain (i.e., a panel compensation value (g_q)) considering characteristics of the display panel DP (refer to fig. 2). The weight WQ can be calculated by equation 7.
[ math 7]
WQ＝W×G_q
The first gamma corrector 130 receives the input image signals RGB. The first gamma corrector 130 corrects the input image signal RGB with the first gamma characteristic and outputs the corrected image signal rgb_c. In one embodiment, the first gamma corrector 130 may correct the input image signal RGB with the gamma 2.2 curve characteristic to output the corrected image signal rgb_c.
The rendering section 140 performs rendering based on the corrected image signal rgb_c and the weight WQ, and outputs a rendered image signal rgb_r.
The second gamma corrector 150 receives the rendered image signal rgb_r. The second gamma corrector 150 corrects in such a manner that the rendered image signal rgb_r has the second gamma characteristic, and outputs the output image signal DS. In one embodiment, the second gamma corrector 150 may correct the rendered image signal rgb_r with a gamma 0.45 curve characteristic to output the output image signal DS. In an embodiment, the output image signal DS may be a signal compensating for degradation characteristics of the input image signal RGB according to the weight WQ.
In an embodiment, the driving controller 100 may not include all of the first gamma corrector 130 and the second gamma corrector 150. When the first and second gamma correctors 130 and 150 are not included, the rendering part 140 may compensate the input image signals RGB according to the input image signals RGB and the weights WQ and output the output image signals DS.
In an embodiment, the driving controller 100 may not include any one of the first gamma corrector 130 and the second gamma corrector 150.
Fig. 6a schematically shows test images IMG1-IMG10 for testing the visibility according to the edges and slope of the images.
Fig. 6b is a diagram showing the test image IMG10 in an enlarged manner.
Referring to fig. 6a and 6b, each of the test images IMG1-IMG10 includes edges E1-E12.
Each of the edges E1-E12 has a predetermined slope with respect to a virtual line VL parallel to the first direction DR 1.
The slope deviation between adjacent two of the edges E1-E12 is 15 degrees. For example, the angle θ between the edge E1 and the edge E2 is 15 degrees.
In addition, the luminance difference between adjacent two of the test images IMG1 to IMG10, that is, the edge intensity is 10%. For example, when the luminance of the edges E1 to E12 of the test image IMG10 is 100%, the luminance of the edge of the test image IMG9 is 90%, the luminance of the edge of the test image IMG8 is 80%, the luminance of the edge of the test image IMG7 is 70%, and the luminance of the edge of the test image IMG1 is 10%.
Fig. 7 exemplarily shows the evaluation scores of the test images IMG1-IMG10 shown in fig. 6a and 6 b.
Referring to fig. 6a, 6b and 7, the test participants are presented with the test images IMG1-IMG10 shown in fig. 6a and are given a score of 1.0 to 5.0 for the visibility of the color edge phenomenon according to the slope of the edge in each of the test images IMG1-IMG10.
As shown in fig. 7, it is confirmed that the lower the slope, that is, as the edge is parallel to the first direction DR1, and the higher the intensity of the edge, the better the color edge phenomenon can be recognized. The intensity of the edge may be the brightness of the edge.
Fig. 8 is a graph showing an example of normalization (normalization) of the compensation value lut_eg with respect to the edge EG detected by the edge and slope detector 110 shown in fig. 5.
Fig. 9 is a graph showing an example of normalization (normalization) of the offset value lut_ag with respect to the angle AG detected by the edge and slope detector 110 shown in fig. 5.
Referring to fig. 7, 8, and 9, it can be confirmed that the offset value lut_eg for the detected edge EG and the offset value lut_ag for the angle AG are suitable for the visibility evaluation result. That is, the higher the brightness of the edge (or the intensity of the edge), the larger the compensation value lut_eg, and the smaller the slope of the edge, the larger the compensation value lut_ag.
Fig. 10 graphically illustrates the visibility test results shown in fig. 7. In fig. 10, the transverse axis is the edge EG and the longitudinal axis is the angle AG.
Fig. 11 exemplarily shows a case of upsampling the edge EG-angle AG graph shown in fig. 10.
The visibility test result shown in fig. 7 is a result of implementation in a limited test environment, and thus if it is up-sampled, the visibility characteristics of the color edge phenomenon according to the edge EG and the angle AG can be obtained as shown in fig. 11.
Fig. 12 shows the product (eg×ag) of the edge EG and the angle AG when the edge EG and the angle AG detected in the edge and slope detector 110 shown in fig. 5 are normalized. It can be confirmed that the graph of the product of the edge EG and the angle AG shown in fig. 12 has a shape similar to the graph of the up-sampling of the visibility test result shown in fig. 11.
Fig. 13 shows differences (EG-AG) between the edge EG and the angle AG when the edge EG and the angle AG detected in the edge and slope detector 110 shown in fig. 5 are normalized. As shown in fig. 13, the difference between the edge EG and the angle AG approaches 0.
Fig. 14a, 14b, and 14c exemplarily show a rendering filter of the rendering section shown in fig. 5.
Fig. 14a exemplarily shows a first rendering filter RF1 for rendering of a first color signal (referred to as R) in an input image signal RGB. The first color signal (R) may be a red signal.
As shown in fig. 3, the first pixel region pxa_r is disposed at the left lower end, and therefore, the weight WQ is disposed as the rendering coefficient in the coordinates (2, 1) and the coordinates (3, 2) of the first rendering filter RF1. In the coordinates (2, 2) of the first rendering filter RF1, 1 to WQx2 are configured as rendering coefficients.
Fig. 14b exemplarily shows a second rendering filter RF2 for rendering of a second color signal (referred to as G) in the input image signal RGB. The second color signal (G) may be a green signal.
As shown in fig. 3, the second pixel region pxa_g is disposed at the middle upper end, and therefore, the weight WQ is disposed as a rendering coefficient in the coordinates (1, 2) of the second rendering filter RF2. In the coordinates (2, 2) of the second rendering filter RF2, 1-WQx2 are configured as rendering coefficients.
Fig. 14c exemplarily shows a third rendering filter RF3 for rendering of a third color signal (referred to as B) in the input image signal RGB. The third color signal (B) may be a blue color signal.
As shown in fig. 3, the third pixel region pxa_b is disposed at the right lower end, and therefore, the weight WQ is disposed as the rendering coefficient in the coordinates (2, 3) and the coordinates (3, 2) of the third rendering filter RF3. In the coordinates (2, 2) of the third rendering filter RF3, 1 to WQx2 are arranged as rendering coefficients.
The rendering part 140 shown in fig. 5 may convolutionally calculate a first color signal (R) and a first rendering filter RF1 in the input image signal RGB, convolutionally calculate a second color signal (G) and a second rendering filter RF2, convolutionally calculate a third color signal (B) and a third rendering filter RF3, and then output a rendered image signal rgb_r.
Fig. 15a shows a test pattern PTN1 of an input image signal RGB.
Referring to fig. 15a, the test pattern PTN1 of the input image signal RGB includes a lattice pattern in which black gray and white gray are alternately arranged, and a horizontal and vertical stripe pattern.
Fig. 15b and 15c exemplarily show a case where the test patterns PTN2, PTN3 are displayed on the display panel DP.
When the low pass filtering is performed on the input image signal RGB without considering the edges and slopes of the input image signal RGB, the test pattern PTN2 shown in fig. 15b may be displayed on the display panel DP (refer to fig. 2).
It can be confirmed that the test pattern PTN1 shown in fig. 15a includes black gray and white gray, but in the test pattern PTN2 shown in fig. 15b, the black gray and white gray become magenta and gray.
When rendering is performed on the input image signals RGB in consideration of edges and slopes of the input image signals RGB, the test pattern PTN3 shown in fig. 15c may be displayed on the display panel DP (refer to fig. 2).
Similar to the test pattern PTN1 shown in fig. 15a, the test pattern PTN3 shown in fig. 15c includes black gray scale and white gray scale.
By the present invention of calculating the weights WQ from the edges and slopes of the input image signals RGB and rendering with the first to third rendering filters RF1 to RF3 (fig. 14a to 14 c) including the weights WQ, a test pattern PTN3 similar to the test pattern PTN1 may be displayed on the display panel DP (refer to fig. 2).
Fig. 16 is a flowchart of an operating method of a display device according to an embodiment of the present invention.
For convenience of explanation, an operation method of the display device will be described with reference to the driving controller shown in fig. 5, but the present invention is not limited thereto. In addition, the duplicate of the contents described with reference to fig. 1 to 15c is omitted.
Referring to fig. 5 and 16, the edge and slope detector 110 detects an edge of the input image signal RGB (step S100).
It is possible to calculate a first edge (eg_x) in a first direction DR1 (refer to fig. 2) (or a lateral direction) of the input image signal RGB and a second edge (eg_y) in a second direction DR2 (refer to fig. 2) (or a longitudinal direction) of the input image signal RGB, and output the sum of the first edge (eg_x) and the second edge (eg_y) as an edge EG.
The edge and slope detector 110 calculates an angle AG between the detected edge EG and a virtual line parallel to the first direction DR1 (see fig. 2) (step S110).
The weight calculator 120 calculates a weight WQ from the edge EG and the angle AG of the input image signal RGB calculated by the edge and slope detector 110 (step S120).
The rendering section 140 may perform rendering according to the input image signals RGB and the weights WQ, and output the output image signal DS (step S130).
While the present invention has been described with reference to the preferred embodiments thereof, it will be understood by those skilled in the art or those having ordinary skill in the art that various modifications and changes may be made thereto without departing from the spirit and scope of the present invention as set forth in the appended claims. Therefore, the technical scope of the present invention is not limited by what is described in the detailed description of the specification, but should be determined by the scope of the claims.

Claims (20)

1. A display device, comprising:
a display panel; and
a driving circuit receiving an input image signal and providing an output image signal corresponding to the input image signal to the display panel,
the driving circuit includes:
an edge and slope detector detecting an edge of the input image signal and calculating an angle between the edge and a virtual line parallel to a first direction;
a weight calculator that calculates a weight from the edge and the angle; and
a rendering section that compensates the input image signal according to the weight and outputs the output image signal,
the weight is calculated by an arithmetic operation of the edge and the angle.
2. The display device according to claim 1, wherein,
the edge and slope detector calculates a first edge by a convolution operation of the input image signal and a first filter,
and calculates a second edge by a convolution operation of the input image signal and a second filter,
and outputting the edge according to the first edge and the second edge.
3. The display device according to claim 2, wherein,
the edge is calculated by the mathematical expression eg= |eg_x|+|eg_y|,
EG is the edge, EG_x is the first edge, EG_y is the second edge.
4. The display device according to claim 3, wherein,
the larger the value of the edge, the greater the weight,
the smaller the angle, the greater the weight.
5. The display device according to claim 2, wherein,
the edge passes through the mathematical formulaTo calculate the number of the points to be calculated,
EG is the edge, EG_x is the first edge, EG_y is the second edge.
6. The display device according to claim 2, wherein,
the first filter comprises a determinant gx, the second filter comprises a determinant gy,
7. the display device according to claim 1, wherein,
the weight calculator includes:
a first lookup table storing a first compensation value corresponding to the edge; and
and a second lookup table storing a second compensation value corresponding to the angle.
8. The display device according to claim 7, wherein,
the weight is calculated by the mathematical formula w= (lut_eg x lut_ag),
w is the weight, lut_eg is the first offset value, and lut_ag is the second offset value.
9. The display device according to claim 7, wherein,
the weight is calculated by the mathematical formula wq= (lut_eg x lut_ag) x G q,
WQ is the weight, lut_eg is the first compensation value, lut_ag is the second compensation value, and g_q is the panel compensation value.
10. The display device according to claim 1, wherein,
the display panel comprises a first pixel, a second pixel and a third pixel which are respectively arranged in the first pixel area, the second pixel area and the third pixel area.
11. The display device of claim 10, wherein,
the first pixel region is configured on the first pixel row,
the second pixel region and the third pixel region are arranged in a second pixel row adjacent to the first pixel row.
12. The display device of claim 10, wherein,
the input image signal includes a first color signal, a second color signal, and a third color signal corresponding to the first pixel, the second pixel, and the third pixel, respectively.
13. The display device of claim 12, wherein,
the rendering section renders the first color signal using a first rendering filter including the weights,
and render the second color signal using a second rendering filter comprising the weights,
and rendering the third color signal using a third rendering filter comprising the weights.
14. A method of operating a display device, comprising:
detecting an edge of an input image signal;
a step of calculating an angle between the edge and a virtual line parallel to the first direction;
a step of calculating a weight from the edge and the angle; and
a step of compensating the input image signal according to the weight and outputting an output image signal,
the weight is calculated by an arithmetic operation of the edge and the angle.
15. The method of claim 14, wherein,
the step of detecting the edge comprises:
a first edge is calculated by a convolution operation of the input image signal and a first filter,
and calculates a second edge by a convolution operation of the input image signal and a second filter,
and outputting the edge according to the first edge and the second edge.
16. The method of claim 15, wherein,
the edge is calculated by the mathematical expression eg= |eg_x|+|eg_y|,
EG is the edge, EG_x is the first edge, EG_y is the second edge.
17. The method of claim 16, wherein,
the smaller the angle, the greater the weight, the greater the value of the edge, and the greater the weight.
18. The method of claim 15, wherein,
the edge passes through the mathematical formulaTo calculate the number of the points to be calculated,
EG is the edge, EG_x is the first edge, EG_y is the second edge.
19. The method of claim 14, wherein,
the weight is calculated by the mathematical formula wq= (lut_eg x lut_ag) x G q,
WQ is the weight, lut_eg is a first compensation value corresponding to the edge, lut_ag is a second compensation value corresponding to the angle, and g_q is a panel compensation value.
20. The method of claim 14, wherein,
the display panel of the display device comprises a first pixel, a second pixel and a third pixel which are respectively arranged in a first pixel area, a second pixel area and a third pixel area,
the first pixel region is configured on the first pixel row,
the second pixel region and the third pixel region are arranged in a second pixel row adjacent to the first pixel row.
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